package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Slf4j
@Service
public class ReportServiceImpl implements ReportService {


    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.isEqual(end)){
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        dateList.add(end);


        List<Double> turnList =  new ArrayList<>();
        //select sum(amount) from orders where order_time > begin and order_time < end and status = 5
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);

            turnover = turnover == null ? 0 : turnover;
            turnList.add(turnover);
        }


        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnList,","))
                .build();
    }

    /**
     * 用户量统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //创建时间列表
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.isEqual(end)){
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        dateList.add(end);

        //存放每天的新增用户量
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();

            map.put("end",endTime);
            Integer numberOfTotalUser = userMapper.countByMap(map);
            totalUserList.add(numberOfTotalUser);

            map.put("begin",beginTime);
            Integer numberOfNewUser = userMapper.countByMap(map);
            newUserList.add(numberOfNewUser);
        }


        //封装到UserReportVO中

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //创建时间列表
        List<LocalDate> dateList = new ArrayList<>();

        while (!begin.isEqual(end)){
            dateList.add(begin);
            begin = begin.plusDays(1);
        }
        dateList.add(end);


        //存放每天的订单数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            //查询每天的订单总数
            Integer orderCount = orderMapper.countByMap(map);

            map.put("status",Orders.COMPLETED);
            //查询每天的有效订单数
            Integer validOrderCount = orderMapper.countByMap(map);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算总的订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算总的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .orderCompletionRate(orderCompletionRate)
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .build();
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop(beginTime,endTime);

        //将列表中的所有name字段的值取出来，并组成一个新的列表
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        //将列表中的所有number字段的值取出来，并组成一个新的列表
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出excel报表接口
     * @param response
     */
    @Override
    public void exportBusinesData(HttpServletResponse response) {
        //查询数据库，获取营业数据--获取近30天的
        LocalDate beginDate = LocalDate.now().minusDays(30);
        LocalDate endDate = LocalDate.now().minusDays(1);

        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(beginDate, LocalTime.MIN), LocalDateTime.of(endDate, LocalTime.MAX));

        //通过POI将数据写入到excel文件中

        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //概览数据
            XSSFSheet sheet1 = excel.getSheet("Sheet1");
            sheet1.getRow(1).getCell(1).setCellValue("日期：" + beginDate + "至" + endDate);
            //获得第四行
            XSSFRow row = sheet1.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获得第五行VO
            row = sheet1.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            //明细数据
            for(int i=0;i<30;i++){
                LocalDate date = beginDate.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                row = sheet1.getRow(i + 7);
                row.getCell(1).setCellValue(String.valueOf(date));
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
